Fixed macro def expansion

Src/AST/Myc.Ast.Visitor.pas

@@ -543,13 +543,8 @@ begin
 end;
 
 function TAstTransformer.VisitMacroDefinition(const Node: IMacroDefinitionNode): IAstNode;
-var
-    N: TMacroDefinitionNode;
 begin
-    N := (Node as TMacroDefinitionNode);
-    N.Name := Accept(N.Name).AsIdentifier;
-    N.Parameters := AcceptParameters(N.Parameters);
-    N.Body := Accept(N.Body);
+    // Do nothing, just pass the node through
     Result := Node;
 end;